The Collaborative International Dictionary of English v.0.48:

Pleurobrachia \Pleu`ro*brach"i*a\, n. [NL. See Pleuro-, and
   Brachium.] (Zool.)
   A genus of ctenophores having an ovate body and two long
   plumose tentacles.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Pleurobrachia
    n 1: sea gooseberries [syn: Pleurobrachia, genus
         Pleurobrachia]